| Pt-Sn工业重整催化剂失活过程金属分散性的原子尺度表征 |
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| 引用本文： | 向彦娟,郑爱国,王春明,徐广通,马爱增. Pt-Sn工业重整催化剂失活过程金属分散性的原子尺度表征[J]. 石油学报(石油加工), 2023, 39(1): 127-133. DOI: 10.3969/j.issn.1001-8719.2023.01.013 |
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| 作者姓名： | 向彦娟 郑爱国 王春明 徐广通 马爱增 |
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| 作者单位： | 中石化石油化工科学研究院有限公司 国家石油化工催化材料与反应工程重点实验室，北京 100083 |
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| 基金项目： | 中国石油化工股份有限公司项目（ST15069）基金资助 |
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| 摘 要： | 重整催化剂活性铂原子的表面分散特性与催化剂的活性密切相关。借助球差校正扫描透射电子显微镜(Cs-STEM)，针对金属Pt、Sn质量分数均为0.3%左右的低负载量的工业Pt-Sn/γ-Al2O3重整催化剂，采用STEM方法研究了不同工业状态下Pt原子在催化剂载体表面的分散特性。结果表明：新鲜催化剂中活性元素Pt以单原子或小原子簇形式分散，催化剂失活的过程是活性Pt原子不断聚集的过程；当Pt-Sn金属聚集体尺寸大到不能再生分散时，则催化剂活性无法恢复。本研究从工业剂角度给出了金属原子分散性与催化剂性能的构效关系。
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| 关 键 词： | 球差校正扫描透射电子显微镜；Pt-Sn/γ-Al2O3 重整催化剂 微观结构；活性组分 |
| 收稿时间： | 2021-08-18 |
Atomic Resolution Characterization of Highly-Dispersive Metal Atoms in Deactivation Process for Commercial Pt-Sn Reforming Catalysts |
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| XIANG Yanjuan,ZHENG Aiguo,WANG Chunming,XU Guangtong,MA Aizeng. Atomic Resolution Characterization of Highly-Dispersive Metal Atoms in Deactivation Process for Commercial Pt-Sn Reforming Catalysts[J]. Acta Petrolei Sinica (Petroleum Processing Section), 2023, 39(1): 127-133. DOI: 10.3969/j.issn.1001-8719.2023.01.013 |
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| Authors: | XIANG Yanjuan ZHENG Aiguo WANG Chunming XU Guangtong MA Aizeng |
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| Affiliation: | State Key Laboratory of Catalytic Materials and Reaction Engineering, SINOPEC Research Institute of Petroleum Processing Co. Ltd., Beijing 100083, China |
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| Abstract: | Surface dispersion characteristics of the active platinum atoms of reforming catalysts are closely related to the catalytic performance. For the low load industrial Pt-Sn/γ-Al2O3 reforming catalyst with the metal Pt and Sn mass fraction of about 0.3%, the distribution characteristics of Pt atoms on the surface of catalyst carrier under different industrial conditions were studied with scanning transmission electron microscopy (STEM) method using the Cs-corrected STEM (Cs-STEM). The results show that the active element Pt in the fresh catalyst was dispersed in the form of single atoms or small clusters, and the deactivation of catalyst is a process of continuous aggregation of active Pt atoms. When the Pt-Sn aggregation fails to disperse further due to its large size, the catalyst activity can not recover again. This study displays the structure-activity relationship between the metal atom dispersion and catalytic performance from the perspective of industrial agent. |
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| Keywords: | Cs-corrected scanning transmission electron microscopy Pt-Sn/γ-Al2O3 reforming catalyst micro-structure active-component |
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